Add configuration to ~/.emacs.d/init.el, if it exists.

This patch modifies the el4r-rctool. The original version will check for the existence of ~/.xemacs/init.el, and if it is not present fall back to ~/.emacs.

However, GNU emacs allows the use of ~/.emacs.d/init.el. In this case the rctool would still create .emacs rather than adding the configuration to ~/.emacs.d/init.el, causing the configuration in ~/.emacs.d/init.el to be no longer loaded.